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ARM: LPC32xx: DT conversion of Standard UARTs

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This patch switches from static serial driver initialization to devicetree
configuration. This way, the Standard UARTs of the LPC32xx SoC can be enabled
individually via DT.

E.g., instead of Kconfig configuration, the phy3250.dts activates
UARTs 3 and 5.

Signed-off-by: Roland Stigge <stigge@antcom.de>
Tested-by: Alexandre Pereira da Silva <aletes.xgr@gmail.com>
This commit is contained in:
Roland Stigge 2012-06-14 16:16:18 +02:00
parent 2c7fa28622
commit c70426f153
5 changed files with 35 additions and 126 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/Kconfig
View File

@ -1019,8 +1019,6 @@ source "arch/arm/mach-kirkwood/Kconfig"
source "arch/arm/mach-ks8695/Kconfig"
source "arch/arm/mach-lpc32xx/Kconfig"
source "arch/arm/mach-msm/Kconfig"
source "arch/arm/mach-mv78xx0/Kconfig"

34
arch/arm/boot/dts/lpc32xx.dtsi
View File

@ -126,24 +126,42 @@
reg = <0x2009C000 0x1000>;
};
/* UART5 first since it is the default console, ttyS0 */
uart5: serial@40090000 {
/* actually, ns16550a w/ 64 byte fifos! */
compatible = "nxp,lpc3220-uart";
reg = <0x40090000 0x1000>;
interrupts = <9 0>;
clock-frequency = <13000000>;
reg-shift = <2>;
status = "disabled";
};
uart3: serial@40080000 {
compatible = "nxp,serial";
compatible = "nxp,lpc3220-uart";
reg = <0x40080000 0x1000>;
interrupts = <7 0>;
clock-frequency = <13000000>;
reg-shift = <2>;
status = "disabled";
};
uart4: serial@40088000 {
compatible = "nxp,serial";
compatible = "nxp,lpc3220-uart";
reg = <0x40088000 0x1000>;
};
uart5: serial@40090000 {
compatible = "nxp,serial";
reg = <0x40090000 0x1000>;
interrupts = <8 0>;
clock-frequency = <13000000>;
reg-shift = <2>;
status = "disabled";
};
uart6: serial@40098000 {
compatible = "nxp,serial";
compatible = "nxp,lpc3220-uart";
reg = <0x40098000 0x1000>;
interrupts = <10 0>;
clock-frequency = <13000000>;
reg-shift = <2>;
status = "disabled";
};
i2c1: i2c@400A0000 {

8
arch/arm/boot/dts/phy3250.dts
View File

@ -94,6 +94,14 @@
};
apb {
uart5: serial@40090000 {
status = "okay";
};
uart3: serial@40080000 {
status = "okay";
};
i2c1: i2c@400A0000 {
clock-frequency = <100000>;

32
arch/arm/mach-lpc32xx/Kconfig
View File

@ -1,32 +0,0 @@
if ARCH_LPC32XX
menu "Individual UART enable selections"
config ARCH_LPC32XX_UART3_SELECT
bool "Add support for standard UART3"
help
Adds support for standard UART 3 when the 8250 serial support
is enabled.
config ARCH_LPC32XX_UART4_SELECT
bool "Add support for standard UART4"
help
Adds support for standard UART 4 when the 8250 serial support
is enabled.
config ARCH_LPC32XX_UART5_SELECT
bool "Add support for standard UART5"
default y
help
Adds support for standard UART 5 when the 8250 serial support
is enabled.
config ARCH_LPC32XX_UART6_SELECT
bool "Add support for standard UART6"
help
Adds support for standard UART 6 when the 8250 serial support
is enabled.
endmenu
endif

85
arch/arm/mach-lpc32xx/serial.c
View File

@ -31,59 +31,6 @@
#define LPC32XX_SUART_FIFO_SIZE 64
/* Standard 8250/16550 compatible serial ports */
static struct plat_serial8250_port serial_std_platform_data[] = {
#ifdef CONFIG_ARCH_LPC32XX_UART5_SELECT
{
.membase = io_p2v(LPC32XX_UART5_BASE),
.mapbase = LPC32XX_UART5_BASE,
.irq = IRQ_LPC32XX_UART_IIR5,
.uartclk = LPC32XX_MAIN_OSC_FREQ,
.regshift = 2,
.iotype = UPIO_MEM32,
.flags = UPF_BOOT_AUTOCONF | UPF_BUGGY_UART |
UPF_SKIP_TEST,
},
#endif
#ifdef CONFIG_ARCH_LPC32XX_UART3_SELECT
{
.membase = io_p2v(LPC32XX_UART3_BASE),
.mapbase = LPC32XX_UART3_BASE,
.irq = IRQ_LPC32XX_UART_IIR3,
.uartclk = LPC32XX_MAIN_OSC_FREQ,
.regshift = 2,
.iotype = UPIO_MEM32,
.flags = UPF_BOOT_AUTOCONF | UPF_BUGGY_UART |
UPF_SKIP_TEST,
},
#endif
#ifdef CONFIG_ARCH_LPC32XX_UART4_SELECT
{
.membase = io_p2v(LPC32XX_UART4_BASE),
.mapbase = LPC32XX_UART4_BASE,
.irq = IRQ_LPC32XX_UART_IIR4,
.uartclk = LPC32XX_MAIN_OSC_FREQ,
.regshift = 2,
.iotype = UPIO_MEM32,
.flags = UPF_BOOT_AUTOCONF | UPF_BUGGY_UART |
UPF_SKIP_TEST,
},
#endif
#ifdef CONFIG_ARCH_LPC32XX_UART6_SELECT
{
.membase = io_p2v(LPC32XX_UART6_BASE),
.mapbase = LPC32XX_UART6_BASE,
.irq = IRQ_LPC32XX_UART_IIR6,
.uartclk = LPC32XX_MAIN_OSC_FREQ,
.regshift = 2,
.iotype = UPIO_MEM32,
.flags = UPF_BOOT_AUTOCONF | UPF_BUGGY_UART |
UPF_SKIP_TEST,
},
#endif
{ },
};
struct uartinit {
char *uart_ck_name;
u32 ck_mode_mask;
@ -92,7 +39,6 @@ struct uartinit {
};
static struct uartinit uartinit_data[] __initdata = {
#ifdef CONFIG_ARCH_LPC32XX_UART5_SELECT
{
.uart_ck_name = "uart5_ck",
.ck_mode_mask =
@ -100,8 +46,6 @@ static struct uartinit uartinit_data[] __initdata = {
.pdiv_clk_reg = LPC32XX_CLKPWR_UART5_CLK_CTRL,
.mapbase = LPC32XX_UART5_BASE,
},
#endif
#ifdef CONFIG_ARCH_LPC32XX_UART3_SELECT
{
.uart_ck_name = "uart3_ck",
.ck_mode_mask =
@ -109,8 +53,6 @@ static struct uartinit uartinit_data[] __initdata = {
.pdiv_clk_reg = LPC32XX_CLKPWR_UART3_CLK_CTRL,
.mapbase = LPC32XX_UART3_BASE,
},
#endif
#ifdef CONFIG_ARCH_LPC32XX_UART4_SELECT
{
.uart_ck_name = "uart4_ck",
.ck_mode_mask =
@ -118,8 +60,6 @@ static struct uartinit uartinit_data[] __initdata = {
.pdiv_clk_reg = LPC32XX_CLKPWR_UART4_CLK_CTRL,
.mapbase = LPC32XX_UART4_BASE,
},
#endif
#ifdef CONFIG_ARCH_LPC32XX_UART6_SELECT
{
.uart_ck_name = "uart6_ck",
.ck_mode_mask =
@ -127,19 +67,6 @@ static struct uartinit uartinit_data[] __initdata = {
.pdiv_clk_reg = LPC32XX_CLKPWR_UART6_CLK_CTRL,
.mapbase = LPC32XX_UART6_BASE,
},
#endif
};
static struct platform_device serial_std_platform_device = {
.name = "serial8250",
.id = 0,
.dev = {
.platform_data = serial_std_platform_data,
},
};
static struct platform_device *lpc32xx_serial_devs[] __initdata = {
&serial_std_platform_device,
};
void __init lpc32xx_serial_init(void)
@ -156,15 +83,8 @@ void __init lpc32xx_serial_init(void)
clk = clk_get(NULL, uartinit_data[i].uart_ck_name);
if (!IS_ERR(clk)) {
clk_enable(clk);
serial_std_platform_data[i].uartclk =
clk_get_rate(clk);
}
/* Fall back on main osc rate if clock rate return fails */
if (serial_std_platform_data[i].uartclk == 0)
serial_std_platform_data[i].uartclk =
LPC32XX_MAIN_OSC_FREQ;
/* Setup UART clock modes for all UARTs, disable autoclock */
clkmodes |= uartinit_data[i].ck_mode_mask;
@ -189,7 +109,7 @@ void __init lpc32xx_serial_init(void)
__raw_writel(clkmodes, LPC32XX_UARTCTL_CLKMODE);
for (i = 0; i < ARRAY_SIZE(uartinit_data); i++) {
/* Force a flush of the RX FIFOs to work around a HW bug */
puart = serial_std_platform_data[i].mapbase;
puart = uartinit_data[i].mapbase;
__raw_writel(0xC1, LPC32XX_UART_IIR_FCR(puart));
__raw_writel(0x00, LPC32XX_UART_DLL_FIFO(puart));
j = LPC32XX_SUART_FIFO_SIZE;
@ -202,7 +122,4 @@ void __init lpc32xx_serial_init(void)
tmp = __raw_readl(LPC32XX_UARTCTL_CTRL);
tmp &= ~LPC32XX_UART_U5_ROUTE_TO_USB;
__raw_writel(tmp, LPC32XX_UARTCTL_CTRL);
platform_add_devices(lpc32xx_serial_devs,
ARRAY_SIZE(lpc32xx_serial_devs));
}